Penstemon digitalis (Foxglove penstemon, Beard tongue)

Boltonias are vigorous perennials grown for their sprays of aster-like flowers, which appear above clean, gray-green foliage. Their vigorous nature makes them suitable for naturalizing. They are also great in the border (and for cutting), but will benefit from frequent dividing to keep in bounds, and may be cut back in late spring for more compact plants. 'Snowbank' produces masses of white flowers in late summer.

This spring bloomer produces bright chartreuse floral domes atop bract-like, rounded leaves that are pierced by the flower's stem. This plant's form and color contrast well with spring bulbs. It grows 3 feet tall and 2 feet wide. Let it regenerate itself by self-sowing. It is a biennial or short-lived perennial that makes an excellent cut flower and produces worthy combinations with neighboring shades of maroons and blues. Grow it in large, mixed borders, naturalistic plantings, and open woodlands.

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This native of Texas and Mexico has a woody base and can form a dwarf, evergreen shrub, 1 foot tall by 1 foot wide. It has small, leathery leaves and bears bright flowers in shades of pink, purple, or yellow from early summer to frost.

This tender perennial climber has edible, hand-shaped leaves and crimson red flowers in summer and fall which are uniquely textured. Their softly squared petals are held apart from each other at the flower's mouth and the rear tapers to long spurs. The blooms yield blue fruits. Flame nasturtium climbs up to 10 feet.